IDE versions 2017.2 run in the new JRE-managed HiDPI mode on MS Windows 8.1/10. This aims at providing better IDE UI scaling, especially in a multi-monitor configuration with different DPI values. However, currently the new HiDPI mode is limited to integral scale values only. Because of that, IDE auto-switches to the previous IDE-managed HiDPI mode once it detects a fractional scale monitor on start. The switch between the HiDPI modes (per-monitor-DPI-aware to system-DPI-aware in terms of WinAPI) may cause UI issues. UI scaling issues may also appear in the following cases:

IDE starts on an integral scale monitor (or a number of monitors) but then a fractional scale monitor is plugged in

The system wakes up from sleep

IDE is used via RDP (Remote Desktop)

Monitors are connected via a docking station.

In order to try to resolve those issues, the following actions may help (some or all):